Rendex Extension

Add Rendex MCP Server as a goose Extension for Screenshots, PDFs, and HTML-to-Image Rendering

This tutorial covers how to add the Rendex MCP Server as a goose extension to capture screenshots, generate PDFs, and render HTML to images from any webpage or raw HTML — useful for archiving UIs, generating invoices and reports, producing OG images, and giving goose a reliable "see the web" capability without spinning up a full browser automation stack.

Configuration

Quick Install

goose Desktop

Launch the installer

goose CLI

Add a Remote Extension (Streamable HTTP) extension type with:

Endpoint URL

https://mcp.rendex.dev/mcp

Custom Request Header

Authorization: Bearer <YOUR_RENDEX_API_KEY>

goose Desktop

goose CLI

Example Usage

Let's use the Rendex extension to generate an invoice PDF from raw HTML and archive a product page.

goose Prompt

1. Render this HTML as an A4 PDF with 1cm margins:

   <!doctype html>
   <html>
     <body style="font-family: system-ui; padding: 40px;">
       <h1>Invoice #0042</h1>
       <p>Bill to: Acme Corp</p>
       <table>
         <tr><td>MCP server listing</td><td>$500.00</td></tr>
         <tr><td>Total</td><td><b>$500.00</b></td></tr>
       </table>
     </body>
   </html>

2. Then take a full-page screenshot of https://news.ycombinator.com in dark mode

3. Return both results so I can save them

goose Output

I'll generate the invoice PDF first, then capture the HN page.

[rendex_screenshot: format=pdf, pdfFormat=A4, pdfMargin={top: 1cm, ...}, html=<invoice markup>]
✓ PDF captured successfully (12,344 bytes)
  width: 1280  height: 800  capturedAt: 2026-04-15T12:34:56Z

[rendex_screenshot: url=https://news.ycombinator.com, fullPage=true, darkMode=true]
✓ Screenshot captured (PNG, 847KB)
  width: 1280  height: 4,321  waitStrategy: networkidle2

Both renders completed. You have:
  1. Invoice PDF (A4, 12.3KB) — base64 in result 1
  2. Dark-mode full-page screenshot of Hacker News (PNG, 847KB) — base64 in result 2

Pricing

Rendex is free to try — no credit card required for the free tier.

Plan	Calls/Month	Rate limit
Free	500	10/min
Starter	10,000	60/min
Pro	100,000	300/min
Enterprise	Custom	1,000/min

Get an API key at rendex.dev.